P1229
Supercharger Intercooler Pump Not Working (Ford)
P1232
Low Speed Fuel Pump Primary Circuit Malfunction (Ford)
P1233
Fuel System Disabled Or Offline (Ford)
P1234
Fuel System Disabled Or Offline (Ford)
P1235
Fuel Pump Control Out Of Range (Ford)
P1236
Fuel Pump Control Out Of Range (Ford)
P1237
Fuel Pump Secondary Circuit Malfunction (Ford)
P1238
Fuel Pump Secondary Circuit Malfunction (Ford)
P1244
Generator Load Low (Ford)
P1245
Generator Load Input High (Ford)
P1246
Generator Load Input Failed (Ford)
P1258
Engine Metal Over Temperature Protection
P1259
VTEC System Malfunction (Acura)
P1260
Fuel Pump Speed Relay Control Circuit (GM)
P1260
Theft Detected – Engine Disabled (Mazda)
P1260
Theft Detected – Engine Disabled (Ford)
P1270
Vehicle Speed Limiter Reached (Mazda)
P1270
Vehicle Speed Limiter Reached (Ford)
P1281
Engine Is Cold Too Long (Chrysler)
P1282
Fuel Pump Relay Control Circuit(Chrysler)
P1285
Cylinder Head Over Temperature Sensed (Ford)
P1288
Intake Manifold Short Runner Solenoid Circuit (Chrysler)
P1290
CHT Sensor Out Of Range (Ford)
P1289
Manifold Tune Valve Solenoid Circuit (Chrysler)
P1289
CHT Sensor High Input (Ford)
P1290
CNG Fuel Pressure Too High (Chrysler)
P1290
CHT Sensor Low Input (Ford)
P1291
No Temp Rise Seen From Fuel Heaters (Chrysler)
P1292
CNG Pressure Sensor Voltage Too High (Chrysler)
P1293
CNG Pressure Sensor Voltage Too Low (Chrysler)
P1294
Target Idle Not Reached (Chrysler)
P1295
No 5 Volts To TP Sensor (Chrysler)
P1296
No 5 Volts To MAP Sensor (Chrysler)
P1297
No Change in MAB From Start To Run (Chrysler)
P1297
Low Voltage ELD Circuit (Acura)
P1298
High Voltage In ELD Circuit (Acura)
P1298
Lean Operation At wide Open Throttle (Chrysler)
P1299
Vacuum Leak Found (IAC Fully Seated)(Chrysler)
P1299
Cylinder Head Over Temperature Protection Active (Ford)
P0400
Exhaust Gas Recirculation Flow Malfunction
P0401
Exhaust Gas Recirculation Flow Insufficient Detected
P0402
Exhaust Gas Recirculation Flow Excessive Detected
P0403
Exhaust Gas Recirculation Circuit Malfunction
P0404
Exhaust Gas Recirculation Circuit Range/Performance
P0405
Exhaust Gas Recirculation Sensor A Circuit Low
P0406
Exhaust Gas Recirculation Sensor A Circuit High
P0407
Exhaust Gas Recirculation Sensor B Circuit Low
P0408
Exhaust Gas Recirculation Sensor B Circuit High
P0410
Secondary Air Injection System Malfunction
P0411
Secondary Air Injection System Incorrect Flow Detected
P0412
Secondary Air Injection System Switching Valve A Circuit Malfunction
P0413
Secondary Air Injection System Switching Valve A Circuit Open
P0414
Secondary Air Injection System Switching Valve A Circuit Shorted
P0415
Secondary Air Injection System Switching Valve B Circuit Malfunction
P0416
Secondary Air Injection System Switching Valve B Circuit Open
P0417
Secondary Air Injection System Switching Valve B Circuit Shorted
P0418
Secondary Air Injection System Relay “A” circuit Malfunction
P0419
Secondary Air Injection System Relay “B” Circuit Malfunction
P0420
Catalyst System Efficiency Below Threshold (Bank 1)
P0421
Warm Up Catalyst Efficiency Below Threshold (Bank 1)
P0422
Main Catalyst Efficiency Below Threshold (Bank 1)
P0423
Heated Catalyst Efficiency Below Threshold (Bank l)
P0424
Heated Catalyst Temperature Below Threshold (Bank 1)
P0430
Catalyst System Efficiency Below Threshold (Bank 2)
P0431
Warm Up Catalyst Efficiency Below Threshold (Bank 2)
P0432
Main Catalyst Efficiency Below Threshold (Bank 2)
P0433
Heated Catalyst Efficiency Below Threshold (Bank 2)
P0434
Heated Catalyst Temperature Below Threshold (Bank 2)
P0440
Evaporative Emission Control System Malfunction
P0441
Evaporative Emission Control System Incorrect Purge flow
P0442
Evaporative Emission Control System leak Detected (small leak)
P0443
Evaporative Emission Control System Purge Control Valve circuit Malfunction
P0444
Evaporative Emission Control System Purge Control Valve Circuit Open
P0445
Evaporative Emission Control System Purge Control Valve Circuit Shorted
P0446
Evaporative Emission Control System Vent Control Circuit Malfunction
P0447
Evaporative Emission Control System Vent Control Circuit Open
P0448
Evaporative Emission Control System Vent Control Circuit Shorted
P0449
Evaporative Emission Control System Vent Valve/Solenoid Circuit Malfunction
P0450
Evaporative Emission Control System Pressure Sensor Malfunction
P0451
Evaporative Emission Control System Pressure Sensor Range/Performance
P0452
Evaporative Emission Control System Pressure Sensor Low Input
P0453
Evaporative Emission Control System Pressure Sensor High Input
P0454
Evaporative Emission Control System Pressure Sensor Intermittent
P0455
Evaporative Emission Control System Tank Detected (gross leak)
P0460
Fuel Level Sensor Circuit Malfunction
P0461
Fuel Level Sensor Circuit Range/Performance
P0462
Fuel Level Sensor Circuit Low Input
P0463
Fuel Level Sensor Circuit High Input
P0464
Fuel Level Sensor Circuit Intermittent
P0465
Purge Flow Sensor Circuit Malfunction
P0466
Purge Flow Sensor Circuit Range/Performance
P0467
Purge Flow Sensor Circuit Low Input
P0468
Purge Flow Sensor Circuit High Input
P0469
Purge Flow Sensor Circuit Intermittent
P0470
Exhaust Pressure Sensor Malfunction
P0471
Exhaust Pressure Sensor Range/Performance
P0472
Exhaust Pressure Sensor Low
P0473
Exhaust Pressure Sensor High
P0474
Exhaust Pressure Sensor Intermittent
P0475
Exhaust Pressure Control Valve Malfunction
P0476
Exhaust Pressure Control Valve Range/Performance
P0477
Exhaust Pressure Control Valve Low
P0478
Exhaust Pressure Control Valve High
P0479
Exhaust Pressure Control Valve Intermittent
P0480
Cooling Fan 1 Control Circuit Malfunction
P0481
Cooling Fan 2 Control Circuit Malfunction
P0482
Cooling Fan 3 Control Circuit Malfunction
P0483
Cooling Fan Rationality Check Malfunction
P0484
Cooling Fan Circuit Over Current
P0485
Cooling Fan Power/Ground Circuit Malfunction
P0486
Exhaust Gas Recirculation Sensor “B” Circuit
P0487
Exhaust Gas Recirculation Throttle Position Control Circuit
P0488
Exhaust Gas Recirculation Throttle Position Control Range/Performance
P0491
Secondary Air Injection System (Bank 1)
P0492
Secondary Air Injection System (Bank 2)
System Too Lean – Bank 1
Description:
How does a P0171 code trigger the check engine light? This code will trigger the check engine light as follows:
The adaptive fuel strategy in the vehicle’s computer constantly monitors the fuel delivery system to make sure the engine is running at an optimum air to fuel ratio, which is 14.7:1. The computer adjusts injector pulse width to regulate the amount of fuel going into the engine. The oxygen sensors relay information to the Powertrain Control Module (computer), informing it of the oxygen content in the exhaust. This information is translated by the computer, and used to determine if more or less fuel is needed. The computer will then adjust fuel flow (and possibly other related engine operating characteristics), to keep the correct air fuel mixture. This loop continues as long as the engine is running. Please refer to our article Oxygen Sensor Code Diagnosis for more info on this system. A P0171 check engine light code is set when the computer has reached a rich calibration limit and can not add enough fuel to maintain the correct mixture.
Possible Causes:
Refer to our Oxygen Sensor Code Diagnosis article for a list of all possible causes. The following is an overview of P0171 check engine light code possible causes.
Fuel System:
Leaking or faulty fuel pressure regulator
Plugged or dirty fuel filter or lines
Fuel pump weak or defective check valve
Injectors leaking or faulty
Low fuel pressure or running out of fuel
Leaking EVAP system components
Faulty FRP (Fuel Rail Pressure Sensor)
Air Intake System
Vacuum leaks
Contaminated, damaged or faulty Mass Air Flow sensor
PCV valve leak or stuck open
Air induction turbulance caused by wrong filter
Oil dipstick not seated
Air leaks after the Mass Air Flow Sensor (MAF)
Oil coated aftermarket air filter
Exhaust System
Any exhaust leak before or near the oxygen sensors
EGR System
Vacuum line disconnected from EGR System Module (ESM)
EGR valve, tube or gasket leak
EGR vacuum regulator valve leaking
Secondary Air Injection System
Mechanically stuck secondary air injection valve
Mass Air Flow (MAF) Circuit Low Input
Description:
How does a P0102 code trigger the check engine light? The engine light will come on if the following concern is present:
The Mass Air Flow Sensor circuit is monitored by the powertrain control module (computer), for low voltage (which translates to low air flow) through the Comprehensive Component Monitor (CCM). With the key on and engine running, if the voltage drops below a minimum value this code will be set, causing the check engine light to illuminate.
Possible Causes:
MAF Sensor disconnected
MAF Sensor circuit open to computer
Vehicle Power circuit open to MAF Sensor
Power Ground circuit open to MAF Sensor
MAF Sensor Return circuit open to PCM
MAF Sensor circuit shorted to Ground
Intake air leak near MAF Sensor
Damaged MAF Sensor
Damaged computer
Diagnostic Help:
Refer to an appropriate manual for specification. If MAF Sensor voltage reading is below minimum limit with key on engine running then concern is a hard fault (present now). If all values are in spec proceed with intermittent diagnosis (refer to our “Intermittent Diagnosis Help” article through the “articles” link on the Navigation Bar). You may also use the “Get Help” link if you need specifications or have any other related questions.
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